summaryrefslogtreecommitdiff
path: root/source3/lib/messages_ctdbd.c
blob: 847ab0fe6a9733f943debeab7d6303dde0a26688 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/* 
   Unix SMB/CIFS implementation.
   Samba internal messaging functions
   Copyright (C) 2007 by Volker Lendecke
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

#ifdef CLUSTER_SUPPORT

#include "librpc/gen_ndr/messaging.h"
#include "ctdb.h"
#include "ctdb_private.h"
#include "ctdbd_conn.h"


struct messaging_ctdbd_context {
	struct ctdbd_connection *conn;
};

/*
 * This is a Samba3 hack/optimization. Routines like process_exists need to
 * talk to ctdbd, and they don't get handed a messaging context.
 */
static struct ctdbd_connection *global_ctdbd_connection;
static int global_ctdb_connection_pid;

struct ctdbd_connection *messaging_ctdbd_connection(void)
{
	if (global_ctdb_connection_pid == 0 &&
	    global_ctdbd_connection == NULL) {
		struct event_context *ev;
		struct messaging_context *msg;

		ev = event_context_init(NULL);
		if (!ev) {
			DEBUG(0,("event_context_init failed\n"));
		}

		msg = messaging_init(NULL, procid_self(), ev);
		if (!msg) {
			DEBUG(0,("messaging_init failed\n"));
			return NULL;
		}
	}

	if (global_ctdb_connection_pid != getpid()) {
		DEBUG(0,("messaging_ctdbd_connection():"
			 "valid for pid[%d] but it's [%d]\n",
			 global_ctdb_connection_pid, getpid()));
		smb_panic("messaging_ctdbd_connection() invalid process\n");
	}

	return global_ctdbd_connection;
}

static NTSTATUS messaging_ctdb_send(struct messaging_context *msg_ctx,
				    struct server_id pid, int msg_type,
				    const DATA_BLOB *data,
				    struct messaging_backend *backend)
{
	struct messaging_ctdbd_context *ctx = talloc_get_type_abort(
		backend->private_data, struct messaging_ctdbd_context);

	struct messaging_rec msg;

	msg.msg_version	= MESSAGE_VERSION;
	msg.msg_type	= msg_type;
	msg.dest	= pid;
	msg.src		= procid_self();
	msg.buf		= *data;

	return ctdbd_messaging_send(ctx->conn, pid.vnn, pid.pid, &msg);
}

static int messaging_ctdbd_destructor(struct messaging_ctdbd_context *ctx)
{
	/*
	 * The global connection just went away
	 */
	global_ctdb_connection_pid = 0;
	global_ctdbd_connection = NULL;
	return 0;
}

NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
			      TALLOC_CTX *mem_ctx,
			      struct messaging_backend **presult)
{
	struct messaging_backend *result;
	struct messaging_ctdbd_context *ctx;
	NTSTATUS status;

	if (!(result = TALLOC_P(mem_ctx, struct messaging_backend))) {
		DEBUG(0, ("talloc failed\n"));
		return NT_STATUS_NO_MEMORY;
	}

	if (!(ctx = TALLOC_P(result, struct messaging_ctdbd_context))) {
		DEBUG(0, ("talloc failed\n"));
		TALLOC_FREE(result);
		return NT_STATUS_NO_MEMORY;
	}

	status = ctdbd_messaging_connection(ctx, &ctx->conn);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("ctdbd_messaging_connection failed: %s\n",
			   nt_errstr(status)));
		TALLOC_FREE(result);
		return status;
	}

	status = ctdbd_register_msg_ctx(ctx->conn, msg_ctx);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("ctdbd_register_msg_ctx failed: %s\n",
			   nt_errstr(status)));
		TALLOC_FREE(result);
		return status;
	}

	global_ctdb_connection_pid = getpid();
	global_ctdbd_connection = ctx->conn;
	talloc_set_destructor(ctx, messaging_ctdbd_destructor);

	set_my_vnn(ctdbd_vnn(ctx->conn));

	result->send_fn = messaging_ctdb_send;
	result->private_data = (void *)ctx;

	*presult = result;
	return NT_STATUS_OK;
}

#else

NTSTATUS messaging_ctdbd_init(struct messaging_context *msg_ctx,
			      TALLOC_CTX *mem_ctx,
			      struct messaging_backend **presult)
{
	return NT_STATUS_NOT_IMPLEMENTED;
}

#endif